Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered. The description adds value beyond that by disclosing a side effect the annotations do not capture: deleting frees one of a limited number of watch slots, which explains the cost of the operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short sentences with the action front-loaded and no filler. The staccato style ("Stop monitoring.") is slightly disjointed but every sentence contributes something and nothing is repeated.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a destructive, two-parameter tool with no output schema and full annotation coverage, the definition covers the core effect and the slot-quota consequence. It still omits whether the watch must exist, what happens to associated data, and how to obtain watch_id, leaving an agent with gaps before calling it.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is only 50%: client_token is described in the schema, but the required watch_id has no description beyond its uuid format. The description never mentions parameters at all, so it does not compensate for the gap or tell the agent where a watch_id comes from (get_watch/list_watches).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the action ("Stop monitoring", "Delete watches") and the resource (a watch), and the title confirms it as the deletion counterpart to get_watch/list_watches. It does not explicitly name a sibling to avoid, but the verb+resource pairing is unambiguous enough for selection.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

"Delete watches you no longer need" implies the cleanup use case and "frees one of your watch slots" hints at a quota constraint that justifies deletion. However, there is no explicit when-not guidance, no mention of prerequisites (e.g. needing an existing watch id from list_watches), and no named alternative.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.